Issue 20, 2021

NiCo2O4 nanosheets as a novel oxygen-evolution-reaction cocatalyst in situ bonded on the g-C3N4 photocatalyst for excellent overall water splitting

Abstract

A 2D/2D coupled NiCo2O4/g-C3N4 nanostructure was fabricated through an in situ growth strategy. NiCo2O4 worked as a novel oxygen-evolution-reaction cocatalyst, and the intimate interface combination by surface bonding and the related cooperative effect between NiCo2O4 and g-C3N4 were comprehensively explored. Consequently, the separation and migration of photo-generated charge carriers for g-C3N4 were efficiently promoted, as well as the energy barriers of the oxygen evolution reaction were reduced. NiCo2O4/g-C3N4 showed obviously enhanced photocatalytic O2-evolution activity (4.6 times that of bare g-C3N4), and the corresponding AQY achieved 4.9% at 380 nm. Then, Pt as a hydrogen-evolution-reaction cocatalyst was employed to cooperate with NiCo2O4 to construct dual cocatalyst loaded g-C3N4 for photocatalytic overall water splitting, in which H2 and O2 simultaneously evolved in a stoichiometric ratio of 2 : 1, and the AQY for H2 evolution reached 2.8% at 380 nm. Consequently, this work demonstrates a reliable strategy for g-C3N4 to construct a photocatalytic system for efficient overall water splitting.

Graphical abstract: NiCo2O4 nanosheets as a novel oxygen-evolution-reaction cocatalyst in situ bonded on the g-C3N4 photocatalyst for excellent overall water splitting

Supplementary files

Article information

Article type
Paper
Submitted
09 jan 2021
Accepted
29 apr 2021
First published
30 apr 2021

J. Mater. Chem. A, 2021,9, 12299-12306

NiCo2O4 nanosheets as a novel oxygen-evolution-reaction cocatalyst in situ bonded on the g-C3N4 photocatalyst for excellent overall water splitting

C. Cheng, L. Mao, J. Shi, F. Xue, S. Zong, B. Zheng and L. Guo, J. Mater. Chem. A, 2021, 9, 12299 DOI: 10.1039/D1TA00241D

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